HashMap并发死循环是个老话题，但每次出事都是真实的生产事故。关键记住三点：JDK7的 transfer 方法是死循环根源、JDK8改尾插法只解决了死循环但没解决线程安全、生产环境跨线程共享的 ...
Unsafe 是 JDK 内部提供的一个魔法类，可以绕过 Java 的所有安全机制，直接操作底层内存、线程、CAS。 做 Java 开发，你可能没直接用过 Unsafe，但你每天都在享受它带来的便利。 AtomicInteger 的原子 ...
A Spring Boot project demonstrating API Rate Limiting using Bucket4j and ConcurrentHashMap, with user identification and authorization handled by Spring Security. The project uses H2 Database to store ...
A Spring Boot backend that demonstrates offline UPI payments routed through a Bluetooth-style mesh network. You're in a basement with zero connectivity. You send your friend ₹500. Your phone encrypts ...
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